Schedule I (PARENT COMPANY ONLY) - Condensed Statements of Earnings and Comprehensive Income (Details) - USD ($) $ in Thousands		12 Months Ended
		Nov. 30, 2024	Nov. 30, 2023	Nov. 30, 2022
Revenues
Revenues		$ 10,515,069	$ 7,441,399	$ 7,149,263
Net revenues		7,034,803	4,700,417	5,978,838
Non-interest expenses
Total non-interest expenses		6,029,257	4,346,148	4,923,276
Earnings (losses) before income taxes		1,005,546	354,269	1,055,562
Income tax expense (benefit)		293,194	91,881	273,852
Net earnings		716,019	262,388	781,710
Preferred stock dividends		74,110	14,616	8,281
Other comprehensive income (loss), net of tax:
Currency translation adjustments and other	[1]	(11,300)	57,530	(53,572)
Minimum pension liability adjustments	[2]	6,243	2,467	3,311
Unrealized gain (losses) on available-for-sale securities		2,189	1,297	(6,161)
Total other comprehensive loss, net of tax	[3]	(27,586)	(16,126)	(7,276)
Comprehensive income attributable to common shareholders		641,687	246,946	769,892
Parent company
Revenues
Principal transactions		(104,505)	(95,642)	(61,407)
Interest		803,068	580,485	317,020
Other		66,438	(3,654)	(66,539)
Revenues		765,001	481,189	189,074
Interest expense		630,994	446,786	317,916
Net revenues		134,007	34,403	(128,842)
Non-interest expenses
Total non-interest expenses		34,285	34,462	69,962
Earnings (losses) before income taxes		99,722	(59)	(198,804)
Income tax expense (benefit)		22,352	(42,322)	(78,338)
Net earnings (losses) before undistributed earnings of subsidiaries		77,370	42,263	(120,466)
Undistributed earnings of subsidiaries from continuing operations		662,346	235,425	905,915
Undistributed earnings of subsidiaries from discontinued operations (including gain on disposal of $3,493 million, $—, $—), net of income taxes		3,667	0	0
Net earnings		743,383	277,688	785,449
Preferred stock dividends		74,110	14,616	8,281
Net earnings attributable to Jefferies Financial Group Inc.		669,273	263,072	777,168
Other comprehensive income (loss), net of tax:
Currency translation adjustments and other		(11,300)	57,530	(53,572)
Change in fair value related to instrument-specific credit risk		(24,718)	(77,420)	49,146
Minimum pension liability adjustments		6,243	2,467	3,311
Unrealized gain (losses) on available-for-sale securities		2,189	1,297	(6,161)
Total other comprehensive loss, net of tax		(27,586)	(16,126)	(7,276)
Comprehensive income attributable to common shareholders		$ 641,687	$ 246,946	$ 769,892

[1] Includes income tax (expenses) benefits of $(1.6) million, $(3.1) million and $15.6 million for the years ended November 30, 2024, 2023 and 2022, respectively.

[2] Includes income tax expense of $2.2 million for the year ended November 30, 2024.

[3] Includes unrealized losses of $2.2 million for the year ended November 30, 2024 related to currency translation adjustments attributable to noncontrolling interests.